Of 100 cars tested, 9 had defective headlights; 8 defective brakes; 7 defected h

Question

Of 100 cars tested, 9 had defective headlights; 8 defective brakes; 7 defected horns; 2 defective windshield wipers; 4 defective headlights and brakes; 3 defective headlights and horns; 2 defective headlights and windshield wipers; defective brakes and horns; none defective brakes and windshield wipers; 1 defective headlight, horn, and windshield wipers, and none had any other combination of defects. Find the number of cars that had at least one of the defects in this questions. The answer is 15, can you please show me how to get this answer, Thank you.

Explanation / Answer

just draw the venn diagram for this question, different set for each, and intersection of each will give car having both defect...from that diagram you can easily solve these type of question

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